CODEWITHSUNDEEP
c++qtqstandarditemmodel
Rajeshwar
Rajeshwar

Reputation: 11651

Retrieving a QStandardItem through QStandardItemModel by searching or key

Is there any way to assign a unique key to an entry in a QStandardItemModel so that we can check for the presence of that key. If it is present we get the relevant QstandardItem ?

Update:

Here is what I am trying to do. I have 3 column in my table so so i have 3 QStandardItem. This is the code I am using:

QStandardItem* item0 = new QStandardItem("Column1");
QStandardItem* item1 = new QStandardItem("Column2");
QStandardItem* item2 = new QStandardItem("Column3");

Now my model is called model and I am attaching these to my model as such

moddel->setItem(0,0,item0);
moddel->setItem(0,1,item1);
moddel->setItem(0,2,item2);

I need to assign a row some unique key so that I could check the model for that key and the model would return the row number. Any suggestions.

Upvotes: 1

Views: 1966

Answers (2)

Damian Dixon
Damian Dixon

Reputation: 979

The answer by pnezis addresses the storing of a key but not the accessing of a QStandardItem from the model. I addressed the storing of data with a QStandardItem by sub classing QStandardItem as I needed to store a lot of complex data.

To obtain the QStandardItem from the model you need to create a QModelIndex instance with the row/column and then call itemFromIndex(index) on the model.

My example is taken from a selection callback.

QModelIndex& selectedItem = itemsSelected.front();
QStandardItemModel* model = reinterpret_cast<QStandardItemModel*>(tableView->model());
if (nullptr == model)
    return;
QStandardItem *item = model->itemFromIndex(selectedItem);
if (nullptr == item)
    return ;

Upvotes: 1

pnezis
pnezis

Reputation: 12321

You could use the setData function of QStandardItem in order to set a custom key for a user defined role, eg

#define MyRole Qt::UserRole + 2
myItem->setData(Qvariant(key), MyRole)

You can get the data of any index in your model by using the data call. 

QVariant d = mymodel->data(anindex, MyRole)

Writing a function that checks if a key exists should be straight forward.

Upvotes: 2

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